Sure, I would have liked Thorin to sport a much larger beard, but I'm completely OKAY with his look. To me, Richard has all but nailed the character and that's the most important element. He's perfect in the warrior/arrogant sense and I truly get that he's a dwarf, a very important dwarf. So I'm fine with this representation.

All that muttered, you do make some very valid arguments as to why Thorin would be even more perfect with a fuller beard.

I'm thinking we might learn why his line have short beards, that could mean either youth or something significant to his particular family.